Thedamwasbuiltintimetoprotecttheinhabitantsfromtheflood;.A.otherwisethedamagewouldbebeyondmeasure.B.thedamage,otherwise,shouldbeverygreat.C.thedamagecouldhavebeenveryseriousotherwise.D.thedamagecaused

Question

The dam was built in time to protect the inhabitants from the flood; ________.
A. otherwise the damage would be beyond measure.
B. the damage, otherwise, should be very great.
C. the damage could have been very serious otherwise.
D. the damage caused, therefore, many of them homeless.
我选的A 但是正确答案是C 求高手指点 讲解详细点啊

Answer 1

建的很及时保护了居民免受水灾.要不然 后接 虚拟语态 （因为没发生只是主观猜测）因为是对过去的推测 显然不能用将来时的虚拟语态
c是虚拟语态 a时态不服